Arrangement for the circulation of digesting liquor in wood pulp digesters



Nov. 10; 1931. E. MORTERUD 1,331,743 ARRANGEMENT FOR THE CIRCULATION OF DIGESTING LIQUOR IN WQOD PULP DIGESTERS Filed Nov. 24. 1950 7 270m Morierud fmw 'y. W 2'" fys,

Patented Nov. 10, 1931 UNITED STATES PATENT OFFICE I EINAR MORTEBUD, OF TORDEROD, NEAR MOSS, NORWAY ARRANGEMENT FOR THE CIRCULATION OF DIGESTING LIQUOR IN WOOD PULP DIGESTERS Application filed November 24, 1930, Serial No. 497,898, and in Norway Kay 14, 1929.

The present invention relates to an arrangement for circulating the digestlng liquor 1n wood pulp digesters and has for its object.

to provide an arrangement, by means of which 5 the circulation of the liquid will take place evenly throughout the digester, whereas at the same time the arrangement will not form an obstruction to the emptying of the digester after the digesting process.

The invention relates to the kind of digesters which are provided between the lower and upper end with an interior or exterior conduit, comprising a pump serving to' circulate the liquor either from the top of the digester to the bottom thereof or in the opposite direction.

In gccordance with the invention thesieve connected with the circulation pipe near the lower end of the digester is located co-axially With the digester without having any connection with the conical bottom part of the same.

By this arrangement it is obtained in the first instance that the liquid passing upwards or downwards through the digester is evenly distributed over the cross section thereof, and secondly pulp and splinters adhering to the sieving surface will not form an obstruction when the digester is to be emptied.

By giving the sieving surface of the centrally arranged lower sieve in the digester the form of a conical surface it is obtained that all material adhering tothe sieve will easily be carried away when the digester is em tied.

tion are diagrammatically illustrated.

In accordance with the form shown on Fig. 1 there is located in the lower part of the digester a sieve 2, having the form of a truncated cone co-axial with the digester and pointin downwards.

The. move is mounted on a tube 3, which is attached to a stave 4. Tube 3 leads through the outside of the digester to pump 5, the manure tube whereof leads to the top of the greater after having passed through aheatiniapparatus or the like (not shown)..

ccording to the form of the invention il' lustrated on Fig. 2 tubes 3 and 6 are both 60 located inside the digester, and are connected n the drawings two forms of the invento a pump 5, which is also placed in the interior of the digester. Sieve 2 in this form of the invention is also given the form of a cone pointing downwards.

Claims:

1. In a pulp digester a circulating device for the digesting liquid comprising a tube connecting the lower part of the digester with the upper part thereof, a mechanlcally driven pump connected with saidtube for circulating liquor therethrough, intake and outlet sieves at the lower and upper end of said tube, the sieve connected with the lower end of the tube being located co-axially with the digester and having no connection with the conical bottom surface thereof.

2. In a pulp digester a circulating device for the digesting liquid comprising a tube connecting the lower part of the digester with the upper part thereof, a mechanically driven pump connected with said tube for circulating liquor therethrough, intake and outlet sieves at the lower and upper end of said tube, the sieve connected with the lower end of said tube having a conical sievin surface located at a certain distance away om the conical bottom surface of the digester and co-axially with the same.

In testimony whereof I afiix my si ature.

EINAR MORTE UD. 

